Its crystals grew directly on basaltic rock or chlorite, more rarely on a first generation of quartz.

An undetermined black to greenish black species of the chlorite group forms very thin, tabular microcrystals comprising spherical clusters which line the walls of cavities, covering total surface areas up to 100 square meters.

Black to greenish black aggregates of chlorite are included in some heulandite crystals, and are particularly aesthetic when the heulandite crystals are transparent.

There is little difference in the clay mineralogy of the Bw and Bk(f) horizons, both being characterized by mixed-layer smectite (most likely probably illite-smectite and probably chloritesmectite), chlorite, illite, kaolinite and quartz.

2 [Angstrom] chlorite peak which in the A horizon appears to be replaced by a weak 12 [Angstrom] peak in the Mg-saturated state.

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